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STEAM GENERATOR. No. 36.4,348.- Patented June 7, 1887.

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4 TTORNEK N PETERS PM Lmographc WM C- [UNITED STATES PATENT OFFICE.

CAMPBELL P. HIGGINS, OF BROOKLYN, NEV YORK.

STEAM-GENERATOR.

SPECIFICATION forming part. of Letters Patent No. 364,348, dated June 7, 1887.

To all whom it may concern:

Be it known that 1, CAMPBELL P. HIGGINS, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a new and useful Iniprovement in Steam-Generators, of which the following is a specification, reference being had to the accompanying drawings, forming a part of the same, in which- Figure l is a front view of a cross-header of a sectional steam-generator embodying my invention, and Fig. 2 a plan view of the same;

7 Figs. 3, 4, and 5, a front, plan and end view,

respectively, of such a header in which an ad ditional heating-tube is arranged.

The object of this invention is to obtain convenient access to the ends and interior of the heating'tubes for the purpose of introducing and operating an expanding-tool for securing the tubes or a tool for scraping or cleaning the interior of the tubes.

The invention is shown in connection with a serpentine form of header embracing aseries of heating'tubes arranged in staggered clusters of three or more, and having handholes with removable covers arranged with relation to each cluster of tubes so that the end of each tube is sufficiently exposed to thehandhole opening for the purpose of securing and cleaning and one or two fully exposed for removing direct, the next adjacent or partiallyexposed tubes being also capable of subsequent removal through the fnlly-exposed openings, as hereinafter explained.

In the drawings, A represents the header; B, the handhole plate or cover; 0, the yoke or clamp for holding the plate in place, and a, b, c, d, and e the heating-tubes.

In Fig. 1 of the drawings a cluster of three heating-tubes is shown, the end of the tube a Application filed October 6, 1566. Serial 215,445. (No in: ('lnl.)

being fully exposed to the handhole open- In Figs. 3 and 4 of the drawings clusters of four tubes each are shown, two of which, (1 and '6, being capable of direct removal and the others capable of indirect removal or insertion through either of the fully-exposed apertures.

It will be observed that in the polygonal form of headers shown the width of the handhole opening is necessarily restricted, and but one or two of the tubes clustered and stag gered as shown can possibly be included in the direct line of the opening. It will also be observed that an additional amount of tubeheating surface can be connected to each header, and as the header is the most expen sive part of the structure, the greater the connected heating-surface the less will be the total cost.

Tliereforewhat I claim, and desire to secure by Letters Patent, is-

A header for steam-generators of polygonal form in crossseetion having aseries of clusters of heating-tubes connected therewith, and pro- 

